Bulk density is influenced by soil texture because different soil textures have different pore spaces. Sandy soils have large pore spaces, while clay soils have small pore spaces. This means that sandy soils have a lower bulk density than clay soils.
In general, bulk density increases as soil texture becomes finer. This is because finer-textured soils have more particles per unit volume, which leaves less pore space. The higher the bulk density, the less pore space there is for water and air to move through the soil. This can lead to problems with drainage and root growth.
Bulk density can also be affected by other factors, such as organic matter content, compaction, and soil structure.